<template>
  <section class="loginContainer">
    <div class="loginInner">
      <div class="login_header">
        <h2 class="login_logo">硅谷外卖</h2>
        <div class="login_header_title">
          <a href="javascript:;" :class="{on: loginWay}" @click="loginWay=true">短信登录</a>
          <a href="javascript:;" :class="{on: !loginWay}" @click="loginWay=false">密码登录</a>
        </div>
      </div>
      <div class="login_content">
        <form @submit.prevent="login">
          <div :class="{on: loginWay}">
            <section class="login_message">
              <input type="tel" maxlength="11" placeholder="手机号" v-model="phone">
              <button :disabled="!rightPhone" class="get_verification" 
                      :class="{right_phone: rightPhone}" @click.prevent="getCode">
                {{computeTime > 0 ? `已发送(${computeTime}s)` : '获取验证码'}}
              </button>
            </section>
            <section class="login_verification">
              <input type="tel" maxlength="8" placeholder="验证码" v-model="code">
            </section>
            <section class="login_hint">
              温馨提示：未注册硅谷外卖帐号的手机号，登录时将自动注册，且代表已同意
              <a href="javascript:;">《用户服务协议》</a>
            </section>
          </div>
          <div :class="{on: !loginWay}">
            <section>
              <section class="login_message">
                <input type="text" maxlength="11" placeholder="手机/邮箱/用户名" v-model="name">
              </section>
              <section class="login_verification">
                <input type="password" maxlength="8" placeholder="密码" v-if="!showPwd" v-model="pwd">
                <input type="text" maxlength="8" placeholder="密码" v-else v-model="pwd">
                <div class="switch_button" :class="showPwd?'on':'off'" @click="showPwd=!showPwd">
                  <div class="switch_circle" :class="{right: showPwd}"></div>
                  <span class="switch_text">{{showPwd ? 'abc' : '...'}}</span>
                </div>
              </section>
              <section class="login_message">
                <input type="text" maxlength="11" placeholder="验证码" v-model="captcha">
                <img src="http://localhost:4000/captcha" alt="captcha" class="get_verification" @click="getCaptcha" ref="captcha">
              </section>
            </section>
          </div>
          <button class="login_submit" >登录</button>
        </form>
        <a href="javascript:;" class="about_us">关于我们</a>
      </div>
      <a href="javascript:;" class="go_back" @click="$router.back()">
        <i class="iconfont icon-jiantou2"></i>
      </a>
    </div>
    <AlertTip :alertText='alertText' v-show="alertShow" @closeTip="closeTip"></AlertTip>
  </section>
</template>

<script>
  import AlertTip from '../../components/AlertTip/AlertTip.vue'
  import {reqSendCode, reqPwdLogin, reqSmsLogin} from '../../api'
  export default {
    name: 'Login',
    data() {
      return {
        loginWay: true, // true - 短信登录； false - 密码登录
        computeTime: 0, // 计时的时间
        showPwd: false, // 是否显示密码
        phone: '', // 手机号
        code: '', // 短信验证码
        pwd: '', // 密码
        name: '', // 用户名
        captcha: '', // 图形验证码
        alertText: '', // 提示文本
        alertShow: false, // 是否显示警告框
      }
    },
    computed: {
      rightPhone() {
        return /^1\d{10}$/.test(this.phone)
      }
    },
    methods: {
      // 异步获取短信验证码
      async getCode() {
        // 启动倒计时（如果当前没有计时）
        if (!this.computeTime) {
          this.computeTime = 30
          this.intervalId =  setInterval(() => {
            this.computeTime--
            if (this.computeTime <= 0) {
              // 停止计时
              clearInterval(intervalId)
            }
          }, 1000)
          // 发送 ajax 请求（向指定手机号发送验证码）
          const result = await reqSendCode(this.phone)
          if (result.code === 1) {
            // 失败了，显示提示
            this.showAlert(result.msg)
            // 停止倒计时
            if (this.computeTime) {
              this.computeTime = 0
              clearInterval(this.intervalId)
              this.intervalId = undefined
            }
          }
        }
      },
      showAlert(alertText) {
        this.alertShow = true
        this.alertText = alertText
      },
      // 异步登陆
      async login() {
        // 前台表单验证
        let result
        if (this.loginWay) { // 短信登录
          const {phone, code} = this
          if (!this.rightPhone) {
            // 手机号不正确
            this.showAlert('手机号不正确')
            return
          } else if (!/^\d{6}$/.test(code)){
            // 短信验证码必须为 6 位数字
            this.showAlert('短信验证码必须为 6 位数字')
            return
          }
          // 发送 ajax 请求 - 短信登录
          result = await reqSmsLogin(phone, code)
        } else { // 密码登录
          const {name, pwd, captcha} = this
          if (!name) {
            // 用户名必须指定
            this.showAlert('用户名必须指定')
            return
          } else if (!pwd) {
            // 密码必须指定
            this.showAlert('密码必须指定')
            return
          } else if (!captcha) {
            // 图形验证码必须指定
            this.showAlert('图形验证码必须指定')
            return
          }
          // 发送 ajax 请求 - 密码登录
          result = await reqPwdLogin({name, pwd, captcha})
        }
        // 停止倒计时
        if (this.computeTime) {
          this.computeTime = 0
          clearInterval(this.intervalId)
          this.intervalId = undefined
        }
        // 根据结果数据，进行相应处理
        if (result.code === 0) {
          const user = result.data
          // 将 user 保存到 vuex 的 state 中
          this.$store.dispatch('recordUser', user)
          // 去个人中心界面
          this.$router.replace('/profile')
        } else {
          // 显示新的图片验证码
          this.getCaptcha()
          this.captcha = ''
          // 显示警告提示
          const msg = result.msg
          this.showAlert(msg)
        }

      },
      // 关闭警告框
      closeTip() {
        this.alertShow = false
        this.alertText = ''
      },
      // 获取一个新的图片验证码
      getCaptcha() {
        // 老师说，如果 src 没有变，就不会刷新（但我的会刷新呀）
        // event.target.src = 'http://localhost:4000/captcha'
        this.$refs.captcha.src = 'http://localhost:4000/captcha'
        // 每次指定不一样的 src 值
        // 跨域了 - 但不是 ajax 请求
        // this.$refs.captcha.src = 'http://localhost:4000/captcha?time=' + Date.now()
      },
    },
    components:{
      AlertTip,
    },
  }
</script>

<style lang="less">
  button {
    outline: none;
  }
  .loginContainer {
    width: 100%;
    height: 100%;
    background: #fff;
    .loginInner {
      padding-top: 60px;
      width: 80%;
      margin: 0 auto;
      .login_header {
        .login_logo {
          font-size: 40px;
          font-weight: 700;
          color: #02a774;
          text-align: center;
        }
        .login_header_title {
          padding-top: 40px;
          text-align: center;
          a {
            color: #333;
            font-size: 14px;
            padding-bottom: 4px;
            &:first-child {
              margin-right: 40px;
            }
            &.on {
              color: #02a774;
              font-weight: 700;
              border-bottom: 2px solid #02a774;
            }
          }
        }
      }
      .login_content {
        form {
          >div {
            display: none;
            &.on {
              display: block;
            }
            input {
              width: 100%;
              height: 100%;
              padding-left: 10px;
              box-sizing: border-box;
              border: 1px solid #ddd;
              border-radius: 4px;
              outline: none;
              font: 400 14px Arial;
              &:focus {
                border: 1px solid #02a774;
              }
            }
            .login_message {
              position: relative;
              margin-top: 16px;
              height: 48px;
              font-size: 14px;
              background: #fff;
              .get_verification {
                position: absolute;
                top: 50%;
                right: 10px;
                transform: translateY(-50%);
                border: 0;
                color: #ccc;
                font-size: 14px;
                background: transparent;
                &.right_phone {
                  color: black;
                }
              }
            }
            .login_verification {
              position: relative;
              margin-top: 16px;
              height: 48px;
              font-size: 14px;
              background: #fff;
              .switch_button {
                font-size: 12px;
                border: 1px solid #ddd;
                border-radius: 8px;
                transition: background-color .3s, border-color .3s;
                padding: 0 6px;
                width: 30px;
                height: 16px;
                line-height: 16px;
                color: #fff;
                position: absolute;
                top: 50%;
                right: 10px;
                transform: translateY(-50%);
                &.off {
                  background: #fff;
                  .switch_text {
                    float: right;
                    color: #ddd;
                  }
                }
                &.on {
                  background: #02a774;
                }
                .switch_circle {
                  position: absolute;
                  top: -1px;
                  left: -1px;
                  width: 16px;
                  height: 16px;
                  border: 1px solid #ddd;
                  border-radius: 50%;
                  background: #fff;
                  box-shadow: 0 2px 4px 0 rgba(0, 0, 0, .1);
                  transition: transform .3s;
                  &.right {
                    transform: translateX(30px);
                  }             
                }
              }
            }
            .login_hint {
              margin-top: 12px;
              color: #999;
              font-size: 14px;
              line-height: 20px;
              a {
                color: #02a774;
              }
            }
          }
          .login_submit {
            display: block;
            width: 100%;
            height: 42px;
            line-height: 42px;
            margin-top: 30px;
            border-radius: 4px;
            background: #4cd96f;
            color: #fff;
            text-align: center;
            font-size: 16px;
            border: 0;
          }
        }
        .about_us {
          display: block;
          font-size: 12px;
          margin-top: 20px;
          text-align: center;
          color: #999;
        }
      }
      .go_back {
        position: absolute;
        top: 5px;
        left: 5px;
        width: 30px;
        height: 30px;
        .iconfont {
          font-size: 20px;
          color: #999;
        }
      }
    }
  }
</style>